Proposition 14 will move California to an open primary system. Everyone will get the same ballot in the primaries, including decline-to-state voters. The top two vote getters in the primary will move on to the general election.
Only two counties voted against the proposition – Orange and San Francisco counties. As KPCC's Patt Morrison noted, these are two of the state's most partisan counties, so it makes sense that they would be opposed to the proposition due to the strong opposition by the parties themselves.
Bob Stern, the president of the Center for Governmental Studies, explained that Prop 14 will likely lead to more moderate Democrats, but not more moderate Republicans, with the Republican Party in California likely to remain very conservative. One site argued that this proposition will create a thousand Joe Liebermans, pushing Democrats toward the right.
The proposition was opposed not just by the major parties, but also third parties. It's going to be particularly difficult for third parties going forward, as there will likely be few third party candidates on the ballot in the general election.
The proposition was sponsored by moderate Republicans Lieutenant Governor Abel Maldonado and Governor Arnold Schwarzenegger.